.main{
    width: 100%;
    height: 1rem;
    position: fixed;
    top: 1rem;
    left: 0;
    z-index: 1;
    display: flex;
    display: -webkit-flex;
    align-items: center;
    justify-content: space-between;
    -webkit-align-items: center;
    -webkit-justify-content: space-between;
    border-bottom: 1px solid #dcdcdc;
    background: #fff;
}
.group{
    font-size: 0.28rem;
    height: 1rem;
    line-height: 1rem;
    padding: 0 0.4rem;
}
.group.active{
    border-bottom: 1px solid #e42321;
}